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 A HISTORY OF CORNWALL HYDROPHILIDAE Hydrobius fuscipes, L. Anacaena globulus, Payk. Penlee - limbata, F. W. Cornwall Philhydrus testaceus, F. maritimus, Thorns. Found by Champion on Samson, Stilly, melanocephalus, Ol. coarctatus, Gredl. S. minutus, F. Helochares lividus, Forst. punctatus, Sharp. Land's End Laccobius sinuatus, Mots - alutaceus, Thorns. Land's End Berosus signaticollis, Charp. - affinis, Brulld Limnebius truncatellus, Thorns. papposus, Muls. nitidus, Marsh. Chaetarthria seminulum, Herbst Helophorus rugosus, Ol. nubilus, F. - intermedius,Muls. Land's End; Pencalenlck aquaticus, L. dorsalis, Marsh. E. Cornwall, rare - aeneipennis, Thorns. mulsanti, Rye affinis, Marsh. - brevicollis, Thorns. Down- derry (Keys) brevipalpis, Bedel Hydrochus elongatus, Schall - angustatus, Germ. Henicocerus exsculptus, Germ. Near Altarnun Octhebius margipallens, Latr. Swarming at the muddy edges of a pond at the mouth of the Seaton, August, 1900 (Keys). St. Mary's and St Agnes, Stilly - marinus, Payk. - pygmaeus, F. - bicolon, Germ. - aeratus, Steph. - lejolisi, Muls et Rey. About fifty specimens of this new British species were obtained by Keys in stagnant salt water or brackish pools above high-tide mark near Rame Hd., September, 1901; two specimens in a rock pool at St. Mary's, Stilly (Champion) Hydraena testacea, Curt. Common above Trebartha - riparia, Kug. - nigrita, Germ. gracilis, Germ. Cyclonotum orbiculare, F. Sphaeridium scarabaeoides, F. S. bipustulatum, F. S. var. marginatum, F. Cercyon littoralis, Gyll. S. depressus, Steph. Whitsand Bay east ,- Penzance ; St. Mary's, Stilly HYDROPHILIDAE (continued) STAPHYLINIDAE (continued) Cercyon haemorrhous, Gyll. haemorrhoidalis, Herbst obsoletus, Gyll. Land's End. aquaticus, Muls. flavipes, F. lateralis, Marsh. melanocephalus, L. unipunctatus, L. S. quisquilius, L. nigriceps, Marsh. Wbltsand Bay east (W. Hobbs) pygmaeus, 111. terminatus, Marsh. analis, Payk. lugubris, Payk. granarius, Er. minutus, Muls. Megasternum boletophagum, Marsh. Cryptopleurum atomarium, F. STAPHYLINIDAE Aleocharis ruficornis, Grav. Occurs in moss near the nests of Formica rufa m Bishop's Wood, Truro fuscipes, F. S. lata, Grav. brevipennis, Grav. bipunctata, Ol. In carrion, Whitsand ; Falmouth ; St. Mary's, Stilly lanuginosa, Grav. moesta, Grav. nitida, Grav. S. var. bilineata, Gyll. In decaying seaweed, Ma- razion morion, Grav. grisea, Kr. In a dead sheep, Rame (Keys) ; in decaying sea- weed, Falmouth ; Tresco, Stilly algarum, Faur. S. obscurella, Er. S. Microglossa suturalis, Sahl. pulla, Gyll. gentilis, Mark. In the com- pany of ants, Bishop's Wood, Truro Oxypoda spectabilis, Mark. - vittata, Mark. opaca, Grav. alternans, Grav. longiuscula, Er. haemorrhoa, Mann. annularis, Sahl. (This difficult genus is well represented in woods, tide- refuse, moss and sandy ex- posures throughout the county, but the above are the only species that have been identified with certainty) Ischnoglossa prolixa, Grav. corticina, Er. Under the bark of fallen branches, Bishops Wood, Truro IQO Ocyusa incrassata, Kr. maura, Er. picina, Aube Phloeopora reptans, Grav. corticalis, Grav. Ocalea castanea, Er. badia, Er. Scawswater, Truro. Ilyobates nigricollis, Payk. Calodera aethiops, Grav. umbrosa, Er. In decaying fungi, Mount Edgcumbe Chilopora longitarsis, Steph. Dinarda markeli, Kies. Taken by Isabell in the Land's End dis- trict from the nests of Formica rufa dentata, Grav. Found in the nest of Formica fusca at Whitsand Bay east Atemeles emarginatus, Payk. Pen- zance district, in the nests of Formica rufa, scarce (Mar- quand) paradoxus, Grav. Found by Keys at Whitsand Bay and by Isabell in the Land's End district ; Bishop's Wood, Truro Myrmedonia limbata, Payk. funesta, Grav. Astilbus canaliculatus, F. S. Callicerus obscurus, Grav. - rigidicornis, Er. Bodmin Thamiaraea cinnamomea, Grav. hospita, Mark. Notothecta flavipes, Grav. anceps, Er. Alianta incana, Er. In stems of Typha latifolia, Marazion plumbea, Wat. In seaweed, Tregantk; Falmouth (Fowler) Homalota currax, Kr. Valley of the Lynher languida, Er. Two specimens in marsh-land, Wadebridge ; several in flood refuse, Lost- toithiel pavens, Er. Under vegetable refuse, Bishop's Wood, Truro. cambrica, Woll. One on the middle reaches of the Lynher gregaria, Er. S. longula, Heer. In wet shingle, fresh or brackish water, Dotvn- derry (Keys) ,- Mount Edg- cumbe (E. A. Newbery) littorea, Sharp. Falmouth imbecilla, Wat. Under rotten seaweed, Falmouth (Fowler) luteipes, Er. fallax, Kr. luridipennis, Mann. elongatula, Grav. Under sea- weed Mevagissey ; Penzance (Marquand) volans, Scrib. vestita, Grav. S. nitidula, Kr. In a dead tree- creeper, Killioiu, Truro